A lumbering stegosaur, even larger than Stegosaurus, quickly runs through the underbrush. It is extremely agile for its size. Its claws and crocodilian features give away its unnatural origin.

Stegospinus is a species of magically created dinosaurs, a hybrid of Stegosaurus and Spinosaurus. It is believed they were created by Yuan-Ti, as a form of war steed. Since the decline of the Yuan-Ti civilization, Stegospinus have been seen in the wild. They breed true, like any other species.

The Stegosaurus looks like an extravagantly colossal stegosaurus. Two key features give away their unnatural origins; their forelegs are clawed and, although they are not as proficient with them as their tails, are exceedingly dangerous weapons. Their crocodilian faces hold two layers of razor sharp teeth, but there are mostly used for consuming vast quantities of toughened vegetation.

What truly limits the chance an ecological takeover by these large brutes are their feeding habits. As mentioned before, they have razor sharp teeth, but those are better at shredding flesh that ripping off plant matter. This, combined the fact that they (like most stegosaurs) cannot chew, makes them even less efficient at consumption and digestion than their mundane cousins.

CombatStegospinus attempt to take advantage of their quickened speed to trample enemies, before engaging in melee. If taking on tougher targets than they could handle, they switch to the defensive, using their large dorsal plates as extra armor.

Toss (Ex): A creature that is at least two sizes smaller than the stegospinus that is hit by the dinosaur's tail slam must make a successful DC 32 Reflex saving throw or be thrown 30 feet in a random direction away from the stegosaurus. The creature takes 1d6 points of damage from being tossed plus an additional 1d6 points of damage if it strikes a solid object before it travels the full distance. The save DC is Strength-based.

Dorsal Plates (Ex): As a move action, a stegospinus can lower its body to place its dorsal plates between it and a single creature. This grants the stegospinus a +4 armor bonus to its Armor Class against the chosen creature. Additionally, if the chosen creature attacks the stegospinus with a light weapon or a natural weapon, the sharp dorsal plates inflict 1d10 points of slashing damage; a successful DC 19 Reflex saving throw halves this damage. The save DC is Dexterity-based.